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Hi zara, welcome to the Sony Forums
Have you tried to reset the camera?
Remove the battery, press and hold the on/off button for 30 seconds, replace the bettery and switch on again.
Let me know if that helps.
Cheers
Mick
Does this work with the RX100? I switch it on and it works - however the next time it may or may not. To get round it I romove the battery, push it back in again (straight away) and it's off working, It's just a pain not knowing whether it'll start or not